Spring Recipes 2
配置集合属性
1.List 实例代码（SequenceGenerator.java + beans.xml + Main.java）：
SequenceGenerator.java
package com.apress.springrecipes.sequence;
import java.util.List;
public class SequenceGenerator {
private List<Object> suffixes;
private int initial;
private int counter;
public SequenceGenerator() {}
public void setSuffixes(List<Object> suffixes) {
this.suffixes = suffixes;
}
public void setInitial(int initial) {
this.initial = initial;
}
public synchronized String getSequence() {
StringBuffer buffer = new StringBuffer();
buffer.append(initial + counter++);
for (Object suffix : suffixes)
buffer.append("-").append(suffix);
return buffer.toString();
}
}
beans.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <list> <value>A</value> <bean class="java.net.URL"> <constructor-arg value="http"/> <constructor-arg value="www.apress.com"/> <constructor-arg value="/"/> </bean> <null /> </list> </property> </bean> </beans>
Main.java
package com.apress.springrecipes.sequence;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
ApplicationContext context =
new ClassPathXmlApplicationContext("beans.xml");
SequenceGenerator generator =
(SequenceGenerator) context.getBean("sequenceGenerator");
System.out.println(generator.getSequence());
System.out.println(generator.getSequence());
}
}
控制台输出结果
100000-A-http://www.apress.com/-null 100001-A-http://www.apress.com/-null
2.Array 实例代码（SequenceGenerator.java + beans.xml + Main.java）：
只需要修改SequenceGenerator.java，其它代码同List
SequenceGenerator.java
package com.apress.springrecipes.sequence;
public class SequenceGenerator {
private Object[] suffixes;
private int initial;
private int counter;
public SequenceGenerator() {}
public void setSuffixes( Object[] suffixes) {
this.suffixes = suffixes;
}
public void setInitial(int initial) {
this.initial = initial;
}
public synchronized String getSequence() {
StringBuffer buffer = new StringBuffer();
buffer.append(initial + counter++);
for (Object suffix : suffixes)
buffer.append("-").append(suffix);
return buffer.toString();
}
}
beans.xml(同上，1. List)
Main.java(同上，1. List)
控制台输出结果(同上，1. List)
3.Set 实例代码（SequenceGenerator.java + beans.xml + Main.java）：
SequenceGenerator.java
package com.apress.springrecipes.sequence;
import java.util.Set;
public class SequenceGenerator {
private Set<Object> suffixes;
private int initial;
private int counter;
public SequenceGenerator() {}
public void setSuffixes( Set<Object> suffixes) {
this.suffixes = suffixes;
}
public void setInitial(int initial) {
this.initial = initial;
}
public synchronized String getSequence() {
StringBuffer buffer = new StringBuffer();
buffer.append(initial + counter++);
for (Object suffix : suffixes)
buffer.append("-").append(suffix);
return buffer.toString();
}
}
beans.xml，注：Spring默认使用LinkedHashSet所以保证了顺序
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <set> <value>A</value> <bean class="java.net.URL"> <constructor-arg value="http"/> <constructor-arg value="www.apress.com"/> <constructor-arg value="/"/> </bean> <null /> </set> </property> </bean> </beans>
Main.java(同上，1. List)
控制台输出结果(同上，1. List)
4.Map 实例代码（SequenceGenerator.java + beans.xml + Main.java）：
SequenceGenerator.java
package com.apress.springrecipes.sequence;
import java.util.Map;
public class SequenceGenerator {
private Map<Object, Object> suffixes;
private int initial;
private int counter;
public SequenceGenerator() {}
public void setSuffixes( Map<Object, Object> suffixes) {
this.suffixes = suffixes;
}
public void setInitial(int initial) {
this.initial = initial;
}
public synchronized String getSequence() {
StringBuffer buffer = new StringBuffer();
buffer.append(initial + counter++);
for (Map.Entry entry : suffixes.entrySet())
buffer.append("-")
.append(entry.getKey())
.append("@")
.append(entry.getValue());
return buffer.toString();
}
}
beans.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <map> <entry> <key> <value>type</value> </key> <value>A</value> </entry> <entry> <key> <value>url</value> </key> <bean class="java.net.URL"> <constructor-arg value="http"/> <constructor-arg value="www.apress.com"/> <constructor-arg value="/"/> </bean> </entry> </map> </property> </bean> </beans>
beans.xml，简写
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <map> <entry key="type" value="A"/> <entry key="url"> <bean class="java.net.URL"> <constructor-arg value="http"/> <constructor-arg value="www.apress.com"/> <constructor-arg value="/"/> </bean> </entry> </map> </property> </bean> </beans>
Main.java(同上，1. List)
控制台输出结果
100000-type@A-url@http://www.apress.com/ 100001-type@A-url@http://www.apress.com/
注：配置空值Map
<property name="nulledMapValue"> <map> <entry> <key><value>null</value></key> </entry> </map> </property>
5.Properties 实例代码（SequenceGenerator.java + beans.xml + Main.java）：
SequenceGenerator.java
package com.apress.springrecipes.sequence;
import java.util.Map;
import java.util.Properties;
public class SequenceGenerator {
private Properties suffixes;
private int initial;
private int counter;
public SequenceGenerator() {}
public void setSuffixes(Properties suffixes) {
this.suffixes = suffixes;
}
public void setInitial(int initial) {
this.initial = initial;
}
public synchronized String getSequence() {
StringBuffer buffer = new StringBuffer();
buffer.append(initial + counter++);
for (Map.Entry entry : suffixes.entrySet())
buffer.append("-")
.append(entry.getKey())
.append("@")
.append(entry.getValue());
return buffer.toString();
}
}
beans.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <props> <prop key="type">A</prop> <prop key="url">http://www.apress.com/</prop> <prop key="null">null</prop> </props> </property> </bean> </beans>
Main.java(同上，1. List)
控制台输出结果
100000-null@null-url@http://www.apress.com/-type@A 100001-null@null-url@http://www.apress.com/-type@A
合并父Bean集合
1.List 实例代码（SequenceGenerator.java + beans.xml + Main.java）：
SequenceGenerator.java(同上，1. List)
beans.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="baseSequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <list> <value>A</value> <value>B</value> </list> </property> </bean> <bean id="sequenceGenerator" parent="baseSequenceGenerator"> <property name="suffixes"> <list merge="true"> <value>A</value> <value>C</value> </list> </property> </bean> </beans>
Main.java(同上，1. List)
控制台输出结果
100000-A-B-A-C 100001-A-B-A-C
2.Set，Map 实例代码（SequenceGenerator.java + beans.xml + Main.java）：
注：Set，Map如果值相同，子元素将覆盖父元素。
SequenceGenerator.java(同上，3. Set)
beans.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="baseSequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <set> <value>A</value> <value>B</value> </set> </property> </bean> <bean id="sequenceGenerator" parent="baseSequenceGenerator"> <property name="suffixes"> <set merge="true"> <value>A</value> <value>C</value> </set> </property> </bean> </beans>
Main.java(同上，1. List)
控制台输出结果
100000-A-B-C 100001-A-B-C
SequenceGenerator.java(同上，4. Map)
beans.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="baseSequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000"/> <property name="suffixes"> <map> <entry key="A" value="A"/> <entry key="B" value="B"/> </map> </property> </bean> <bean id="sequenceGenerator" parent="baseSequenceGenerator"> <property name="suffixes"> <map> <entry key="A" value="a"/> <entry key="C" value="C"/> </map> </property> </bean> </beans>
Main.java(同上，1. List)
控制台输出结果
100000-A@a-C@C 100001-A@a-C@C